I've been asked to share the link for the clip art images I use. Shhh! Don't tell anyone, it's a secret.....but I just go to Google's search page, at the top there's a list "SEARCH--IMAGES--YOUTUBE. etc., etc". Click on the "IMAGES" button and then type what you want to find in the search box.
This is how I found the sombrero to use on the cards this afternoon as well as the image of the girl holding the shell to her ear.
Like any search engine, you may need to re-word your search criteria to find exactly what you want. For example, I had typed in "sombrero clip art" then I tried just "sombrero" and found the one I used.